Using query string with InfoPath forms

Sometimes it is necessary to accept query string for browser enabled info path forms. This can be done by hosting the Infopath form in a asp.net page and hosting that page within Sharepoint using the XmlFormView class.

This technical guide explains the process

http://msdn.microsoft.com/en-us/aa701078.aspx

The code behind for the asp.net page will contain a method like the one shown below..

protected void XmlFormView1_Initialize(object sender, InitializeEventArgs e)
{
string positionAppliedFor = Request.QueryString["Position"];
string jobID = Request.QueryString["JobID"];
string appURL = Request.QueryString["AppURL"];

if (!string.IsNullOrEmpty(positionAppliedFor) && (!string.IsNullOrEmpty(jobID)))
{
// Create an XPathNavigator positioned at the root of
// the form's main data source.
XPathNavigator xNavMain = XmlFormView1.XmlForm.MainDataSource.CreateNavigator();
// Create an XmlNamespaceManager and add the "my" namespace
// alias from the form's main data source.
XmlNamespaceManager xNameSpace = new XmlNamespaceManager(new NameTable());
xNameSpace.AddNamespace("my", "http://schemas.microsoft.com/office/infopath/2003/myXSD/2008-07-08T12:49:29");
// Create an XPathNavigator positioned on the form's field2.
XPathNavigator fTextBoxPosition = xNavMain.SelectSingleNode(
"/my:myFields/my:gpRecommendation/my:txtPositionAppliedFor", xNameSpace);
// Set the form's job Position Value to the value passed in the query strings
fTextBoxPosition.SetValue(positionAppliedFor);

XPathNavigator fTextBoxJobID = xNavMain.SelectSingleNode(
"/my:myFields/my:gpRecommendation/my:txtJobID", xNameSpace);
fTextBoxJobID.SetValue(jobID);

if (!string.IsNullOrEmpty(appURL))
{
XPathNavigator fTextBoxAppURL = xNavMain.SelectSingleNode(
"/my:myFields/my:gpRecommendation/my:txtAppURL", xNameSpace);
fTextBoxAppURL.SetValue(appURL);
}
}
}